Uh... not to state the obvious here, Brian... but uh... that's what wood leveling blocks are for?
I realize that balancing hundreds of pounds of trailer load on a stack of scrap wood and a stick (the spring gauge) is typical of RV practice, but I like to do better. Rather than hunting for a scrap of just the right thickness, a height-adjustable scale would be nice.
Of course the bathroom scale approach has the same problem, but it is readily addressed by using an adjustable stabilizer stand between the scale and the coupler. Here's my Boler
on my bathroom scale:
Perhaps it is an unfair stereotype, but I expected that the design of a German product (I was guessing - probably incorrectly - that the separate nose weight
gauge was also from Winterhoff) would have addressed this functional issue; that's why I asked if there is a standard coupler height which would make adjustment unnecessary.
By the way, the separate gauge appears to be the one sold by suppliers such as Towsure
(I don't know the actual maker), and handles only 80 kg (176 lb) - not enough for many of our eggs.